qa_if-else-function/src/ifElse.test.js at 6ab18718f09d4da226c97270556199a113f46684 · mate-academy/qa_if-else-function · GitHub

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"use strict";

describe(`ifElse`, () => {
  const { ifElse } = require(`./ifElse`);

  it(`should be a function`, () => {
    expect(ifElse).toBeInstanceOf(Function);
  });

  it(`the first function must be called`, () => {
    const condition = () => true;
    let count = null;

    const first = () => {
      count = 1;
    };

    const second = () => {
      count = 2;
    };

    ifElse(condition, first, second);
    expect(count).toBe(1);
  });

  it(`if function returns a 'truthy'
  the second function must be called`, () => {
    const condition = () => "hello";
    let count = null;

    const first = () => {
      count = 1;
    };

    const second = () => {
      count = 2;
    };

    ifElse(condition, first, second);
    expect(count).toBe(2);
  });

  it(`the second function must be called`, () => {
    const condition = () => false;
    let count = null;

    const first = () => {
      count = 1;
    };

    const second = () => {
      count = 2;
    };

    ifElse(condition, first, second);
    expect(count).toBe(2);
  });

  it(`should return undefined`, () => {
    const result = ifElse(
      () => Math.random() > 0.5,
      // eslint-disable-next-line no-console
      () => console.log(1),
      // eslint-disable-next-line no-console
      () => console.log(2),
    );

    expect(result).toBeUndefined();
  });
});